. Mining and Scientific Press . e U. of Mines and Chemical Warfare Service, U. S. Army,was given the afternoon of May 26 in the special smokeroom of the Bureau at Pittsburgh. In this test two menentered the smoke-room which contained 1% of carbonmonoxide gas in the air. One of the men carried a canarybird into the room to indicate to the observers the poisonousnature of the atmosphere The canary collapsed in 45 sec-onds, and was immediately removed to fresh air where itwas revived with oxygen. While the gas-mask used willgive protection in higher percentages of carbon % of
. Mining and Scientific Press . e U. of Mines and Chemical Warfare Service, U. S. Army,was given the afternoon of May 26 in the special smokeroom of the Bureau at Pittsburgh. In this test two menentered the smoke-room which contained 1% of carbonmonoxide gas in the air. One of the men carried a canarybird into the room to indicate to the observers the poisonousnature of the atmosphere The canary collapsed in 45 sec-onds, and was immediately removed to fresh air where itwas revived with oxygen. While the gas-mask used willgive protection in higher percentages of carbon % of carbon monoxide in the air will kill a man in a fewminutes time. The percentage found in working placeswhere there is ventilation usually amounts to considerablyless than 1%. One tenth of 1 % of carbon monoxide, how-ever, will seriously affect a man who is working and there-fore breathing hard in about one-half hours time, whiletwo-tenths will affect him seriously in about 10 minutes. 9, 1921 MINING AND S( II \ I II l< PR|. T. A. ?KICKARV. .... Editor m iiiiiiiiiiii i i i mimiii iiiiiiiii inn nn I nmiiininniiiniill I i Hill i iinn HOW th. win-Ills business is interlocked is sug)by the fact, among others, thai the exporl tradeoppiT fluctuates with foreign exchange. When th<lar is at an excessive premium, our foreign custoicannot afford to buy our copper. EFFORTS to end the flotation tangle by the purchaseof the Minerals Sep company s oumerous American patents have failed, owing to a wide diffenbetween the price demanded and that which the Leadingcopper operators were willing to pay. THE War taughl us to think in billions of dollars, bu1Russia is inaugurating a new era in finance, In thaidistressful country ruble notes are now being issued bj the trillion. For the first four and a half ntha of the present year the amount aggregated 1,168,1 000,000 rubles, as against («mi for the same pethist year. ON another page we publish a short article onditions in Europe a
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